Twilight has just become a Princess but she is still getting used to her title and new wings, she and her friends spend the night at Canterlot Castle after her coronation.

Daydreamer finally introduces Sunset to Twilight before a strange shadow strikes, the shadow took two things before leaping into the mirror and escaping into the human world.
The first thing it took was Twilights crown and secondly was the darkness inside Sunset, luckily fate intervened when the shadow lost it's grip on the crown as it flew into the portal.

Now it's up to Twilight and Spike to retrieve the crown but this time they'll be accompanied by Sunset and Daydreamer.

(stories like this could really do with a main 5 tag, the 5 being the human counterpart to Twilights friends while keeping Twilight and Sunset separate as to me Main 7 is Sci-Twi's period.)